Issue 171 is the one hundred and seventy-first edition of Sonic the Comic, the UK's official SEGA comic. Released on the 15th December 1999, at the price of £1.30, the comic contained one original stories, three reprints and a couple of features, as well as competitions to win Sonic the Movie and Meccano sets.
- Sonic the Hedgehog - Planet in Peril!
- Knuckles the Echidna - The Ghost Ship: Part 6 (from Issue 79)
- Graphic Zone
- Tails - The Land Beyond: Part 1 (from Issue 18)
- Sonic the Hedgehog - Ice Cap Attack: Part 2 (from Issue 42)
- Next Issue
Planet in Peril! is a complete story written by Lew Stringer, drawn by Richard Elson and lettered by Ellie de Ville. Sonic and Tekno the Canary respond to cries for help when a Christmas tree dies. Worse still, a robotic snowman is on the rampage. All clues point to Doctor Robotnik and The Plax.
This issue's Graphic Zone has the theme of Christmas Fun!, with Sonic, Tails and Knuckles enjoying Christmas. One picture features Sonic and Tails joined together by "Link Rings". Featured pictures won their creators a Sonic the Hedgehog watch.
- Richard Elson - cover art
- Andy Diggle - editor
- Gary Knight - designer
- Steve MacManus - managing editor
- Sarah Colley - production
- Douglas Pocock - marketing manager
- Michelle Brown - promotions
- Rob McMenemy - marketing director
- Julie Goldsmith - managing director