S1. Series I

6 episodes · 1988

S2. Series II

6 episodes · 1988

S3. Series III

6 episodes · 1989

S4. Series IV

6 episodes · 1991

S5. Series V

6 episodes · 1992

S6. Series VI

6 episodes · 1993

S7. Series VII

8 episodes · 1997

S8. Series VIII

8 episodes · 1999

S9. Back to Earth

3 episodes · 2009

S10. Series X

6 episodes · 2012

S11. Series XI

6 episodes · 2016

S12. Series XII

6 episodes · 2017

Specials

118 episodes · 1994