In an unlikely twist, 'real' vigilante Slim Shady comes to town to swindle the colonel himself and hilarity ensues.
The story line is just plain silly but holds the audience like a gin-trap.
Many took the opportunity to get into the spirit by dressing-up in theme complete with cowboy hats and (plastic) six-shooters.
The show is played in the 'transverse', meaning the audience sits on both sides of the stage. Congratulations go to choreographer Lily Empson for coaching her enthusiastic crew through a series of corset-busting routines set to foot-stomping rock, pop and country classics arranged by musical director Vasa Faaosofia.
Every show has its stand-out performances; leads, including Spencer Littlewood, Duncan Bouwer and Ruby Brett came across well.
So did Ben Wilson as Tallulah who would not be out of place in the Rocky Horror Show and the crazy trio of Takz Southon, Kate Booker and Adam Rangitaawa, who play Los Banditos with shades of Came a Hot Friday.
Designed to appeal to end-of-year audiences out for a good time, Cowboy Christmas is Riverlea Theatre's big fundraiser for the year which will help towards projects including its long-awaited rebuild.
• Cowboy Christmas, written by Michael Switzer, directed by Mel Martin, production Maureen Cruickshank, Musical direction Vasa Faaosofia, choreography Lily Empson. Cowboy Christmas concludes December 14. Dinner and show offered, Bookings iTicket or call the theatre 07 856 5450. Bar open at 6pm, dinner 6.30pm.