Graham Parker looks at the weekend weather

A cartoon film series
The underwater adventures of Marine Boy, the Ocean Patrol and the white dolphin, Splasher

A series of adventures set under the Big Top

Corky intervenes when Chief Spotted Horse and his tribe are unjustly accused of horse-stealing.

Introduced by David Coleman direct from Aintree
featuring The Grand National: BBC colour outside broadcast cameras bring you the world's greatest steeplechase.

Also in Grandstand: International Rugby Union, Wales v France - the second half of today's match at Cardiff Arms Park which will have a vital bearing on the International Championship; Rugby League Cup Semi-final, Castleford v St Helens; Fight of the Week.

12.45; 1.40* Grand National Day at Aintree
12.45* David Coleman sets the scene and talks to some of the leading jockeys.
1.40* A jockey's-eye view of the famous Aintree fences.
2.0 Liverpool Hurdle (over 2 miles 100 yards)
2.10* Action film of the fancied Grand National runners.
2.35 Hylton Stakes (over 6 furlongs)
2.40* A final check on the runners and riders, and coverage of the Grand National parade.
at 3.20 The Grand National
BBC outside broadcast cameras capture the thrills of Becher's, Valentine's, The Chair, and the rest of the formidable National course as the world's top steeple-chasers battle over 4 miles 856 yards for a first prize of £17,500.

1.5* Football Preview
Introduced by Sam Leitch

1.20* Fight of the Week: Jimmy Tibbs (West Ham) v Johnny Kramer (West Ham)
Highlights of this middleweight fight at York Hall, Bethnal Green.

3.40* Rugby Union: Wales v France
The second half of today's vital International match at Cardiff.
Commentator Bill McLaren with summaries by Cliff Morgan

4.30* Rugby League Cup Semi-final: Castleford v St Helens
Live coverage from Swinton of the last half-hour of today's semi-final to decide who meets Wigan in the final at Wembley on 9 May.

5.0* Results Service
Football, racing, and rugby results, and action from today's sport.

Another hilarious episode in the life of the delectable Debbie Reynolds starring as Debbie Thompson with the family she delights, mystifies, maddens

This week: Hurray for Our Side ...or cheers for Debbie's lot!

by Jimmy Perry and David Croft
Starring Arthur Lowe, John Le Mesurier and Clive Dunn
featuring John Laurie as Pte Frazer, James Beck as Pte Walker, Arnold Ridley as Pte Godfrey, Ian Lavender as Pte Pike

In which our heroes add an armoured car to their fighting strength.

Writer-producer David Croft with his co-author Jimmy Perry received the Writers Guild of Great Britain 1969 Award for the Best British Comedy Script for their work on Dad's Army.

Signature tune by Jimmy Perry and Derek Taverner, played by the Band of the Coldstream Guards conducted by their Director of Music, Capt Trevor L. Sharpe

Tonight's presentation in this season of feature films stars Cornel Wilde, Constance Smith, Finlay Currie

Cornel Wilde faces the perils of the Guatemalan jungle when - as a French nobleman, cheated of his inheritance - he joins a dangerous quest for the treasure of the lost Mayan civilisation.
Written and directed by Delmer Daves

For the Deaf
Synopses are available for these forthcoming plays on BBC1: for adults, Z Cars (13, 14, 20, 21 April); The Force of Circumstance (23 April); Doomwatch (6 April); The Doctors (29, 30 April, 6, 7 May); for children, Dr Who (4 April-2 May); The Children of Totem Town (8-29 April); Belle and Sebastian (6-27 April). Write to [address removed].

Television's fastest spectacular bringing back the Magic of the Minstrels
Starring The Mitchell Minstrels
featuring John Boulter, Dai Francis, Margaret Savage, Andy Cole, Peter Kaye
with The Television Toppers
and Les Rawlings, Elspeth Hands, Delia Wicks, Benny Garcia, Les Want, Jean McGuire

(The Black and White Minstrels are appearing in 'Magic of the Minstrels' at the Victoria Palace, London, and in 'The Black and White Minstrel Show' at the Alhambra Theatre, Bradford)

A Man Called Ironside criminal investigator extraordinary
A film series starring starring Raymond Burr as Robert Ironside with Don Galloway as Det-Sgt Brown, Barbara Anderson as Officer Eve Whitfield and Don Mitchell as Mark Sanger

Eve is shot and critically wounded by a murderer.

With Kenneth Kendall and Weather

Association Football
The last Saturday of the Football League programme sees Match of the Day at a well-known ground highlighting one of the key end-of-the-season soccer issues.
Highlights of a second match involving a prominent club in the South-East.
(Today's matches to be announced at the end of Grandstand)

The Grand National
Another chance to see the world's most famous steeplechase, run this afternoon at Aintree

Each week: 25,000 tons of newsprint; 50 hours of news bulletins
One man, Bernard Braden. and his team - John Pitman, Esther Rantzen, Sean O'Reilly - take a look at some of the things that happened-and some of the things that didn't.
Musical memory: Ronnie Carroll 'Walk hand in hand' (1956)
Children: Harold Williamson
Song of the week: Jake Thackray