from TheTVDB: The gang are short of money again, and lend themselves to animal experiments.

1998 episode

contained in

Complete Collection (2002) - Discover the Joy of Rex. Join REX THE RUNT and his chums - the pert-bum-loving Wendy, Chuffy-chomping Bad Bob, and our own little Hoover-hankering Vince - for bizarre Telly adventures with Easter Island stone-head aliens, singing sausages, a Sinister Secret Laboratory, the Go-Back-In-Time-A-Tron and more!