Convict 99 is a 1938 British comedy film directed by Marcel Varnel and starring Will Hay, Moore Marriott, Graham Moffatt and Googie Withers.

On the way to what Twist believes is the school, he becomes drunk, and on arrival is mistaken for Max Slessor, a prisoner who had escaped during a jailbreak.

Things take a turn for the worse, when the recaptured Slessor escapes again with a signed cheque.

Altering the figures, he draws the entire prison funds from the bank.

Twist and some of the convicts head in a prison van to Limehouse, in east London, to catch Slessor, recover the lost funds and then successfully break into the bank in the middle of the night to return the money.